Four rubber tubes are filled with $H_2, O_2, N_2$,and $He$ respectively. Which of these tubes will deflate first?

$A$ gaseous mixture contains equal masses of dihydrogen gas,dioxygen gas and methane gas at a total pressure of $380 \ torr$. The partial pressure of methane gas is ........... $torr$.

At constant volume and temperature conditions,the rate of diffusion $D_A$ and $D_B$ of gases $A$ and $B$ having densities $\rho_A$ and $\rho_B$ are related by the expression:

At $500 \, K$ temperature in a $2 \, L$ vessel,$0.32 \, g$ of $O_2$ gas is collected over water. If the vapour pressure of water is $32 \, mbar$ at $500 \, K$,find the partial pressure of dry $O_2$ gas. $(R = 8.314 \times 10^{-2} \, L \, bar \, mol^{-1} \, K^{-1})$

Explain the following terms:
$(i)$ Isotherm
$(ii)$ Isochore
$(iii)$ Isobar

When an equal weight mixture of $SO_2$ and $O_2$ is taken in an empty container,the ratio of the partial pressure of $O_2$ to the total pressure is ......